<content> <rng:choice> <rng:data type="string"> <rng:param name="pattern">centertext\((A|B|C|D|E|F|G)(f|♭|n|♮|s|♯)?\)</rng:param> </rng:data> <rng:data type="string"> <rng:param name="pattern">centertext\(H(s|♯)?\)</rng:param> </rng:data> </rng:choice> </content>